Machine tool



FIG. 1 is a perspective view of a machine tool illustrating our new design;

FIG. 2 is a front view in elevation of the machine tool shown in FIG. 1;

FIG. 3 is a right side view in elevation of the machine tool shown in FIG. 1;

FIG. 4 is a left side view in elevation of the machine tool shown in FIG. 1; and

FIG. 5 is a plan view in elevation of the machine tool shown in FIG. 1. 

The ornamental design for a machine tool, as shown and described. 